Week of the Year
What week number is it today?
Week Dates
| Day | Date |
|---|---|
| Sunday | March 1, 2026 |
| Monday | March 2, 2026 |
| Tuesday | March 3, 2026 |
| Wednesday | March 4, 2026 |
| Thursday | March 5, 2026 |
| Friday | March 6, 2026 |
| Saturday | March 7, 2026 |
Related Tools
Frequently Asked Questions
Week of the Year: The Complete Guide to ISO 8601 Week Numbering
Week numbers are one of the most widely used—yet least understood—time-tracking conventions. Businesses use them for quarterly reporting, manufacturers for production scheduling, software developers for sprint planning, and educators for academic calendars. Our Week of Year tool shows you today's week number instantly, along with a progress bar, dates for the current week, and weeks remaining in the year.
Understanding ISO 8601 Week Numbering
This means that January 1 does not always fall in Week 1. If January 1 is a Friday, Saturday, or Sunday, it belongs to the last week of the previous year (Week 52 or 53). Conversely, late December dates sometimes fall into Week 1 of the following year. This can confuse people who assume weeks always align with calendar years, but the ISO system ensures consistency for international scheduling and data exchange.
52 Weeks vs. 53 Weeks
Most years have exactly 52 ISO weeks. However, certain years have 53 weeks:
- Years that start on Thursday (in non-leap years)
- Years that start on Wednesday or Thursday (in leap years)
Week Number Reference Table
| Week | Approximate Date Range | Notable Period |
|---|---|---|
| Week 1 | Jan 1–7 (varies) | New Year, goal-setting |
| Week 5 | Late January | End of January, Q1 underway |
| Week 9 | Late February | Tax season begins (US) |
| Week 13 | Late March | End of Q1 |
| Week 17 | Late April | US tax deadline week |
| Week 22 | Late May | Memorial Day week (US) |
| Week 26 | Late June | Mid-year / End of Q2 |
| Week 30 | Late July | Mid-summer |
| Week 35 | Late August | Back to school |
| Week 39 | Late September | End of Q3 |
| Week 44 | Late October | Halloween week |
| Week 48 | Late November | Thanksgiving week (US) |
| Week 52 | Late December | Year-end, holiday season |
Week Numbers in Different Industries
Different sectors rely on week numbers for different purposes:
- Manufacturing: Production scheduling, quality control tracking, and inventory cycles are organized by week number. "We produced 12,000 units in Week 34" is standard factory language. ISO weeks ensure that multinational supply chains stay synchronized.
- Software development: Agile sprints are often mapped to ISO weeks. A 2-week sprint starting in Week 10 runs through Week 11. Release notes, bug reports, and performance metrics are frequently tagged by week number.
- Retail and marketing: Sales campaigns, promotional calendars, and seasonal planning use week numbers to coordinate across stores, regions, and channels. "Black Friday week" is typically Week 47 or 48.
- Healthcare: Epidemiological reporting uses CDC weeks (similar to ISO weeks) to track disease outbreaks, vaccination rates, and public health trends. "Flu peaked in Week 5" is standard CDC communication.
- Education: Academic semesters are divided into teaching weeks. "Week 8 of the semester" tells faculty and students exactly where they are in the curriculum.
Fiscal Year Weeks
Many companies use fiscal years that don't align with the calendar year. A company with a fiscal year starting April 1 would have its "Fiscal Week 1" in early April, while the calendar shows ISO Week 13 or 14. Some retailers (like Walmart) use a 4-5-4 calendar system, where the year is divided into 13 periods of 4 or 5 weeks each, ensuring each period has the same number of weekends for comparable sales data.
Using Week Numbers for Goal Tracking
One powerful application of week numbers is personal productivity. With 52 weeks in a year, you can set weekly targets that compound over time:
- Read 1 book per week = 52 books per year
- Save $50 per week = $2,600 per year
- Exercise 3 times per week = 156 workouts per year
- Write 1,000 words per week = 52,000 words (a novel) per year
Checking the current week number provides instant progress awareness. If you're in Week 26 and have read 20 books, you know you're 6 behind pace and can adjust accordingly.
Our Week of Year calculator updates daily, is free, and runs entirely in your browser. For related tools, see Days Left in Year, Calendar, Weeks Left in Year, and Today's Date.